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KMSAN: uninit-value in extent_fiemap

Status: auto-obsoleted due to no activity on 2023/11/22 23:18
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+8d245945ddc97769435f@syzkaller.appspotmail.com
First crash: 905d, last: 649d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] KMSAN: uninit-value in extent_fiemap 0 (1) 2023/03/06 17:56

Sample crash report:
BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop1 scanned by syz-executor.1 (7669)
BTRFS info (device loop1): using blake2b (blake2b-256-generic) checksum algorithm
BTRFS info (device loop1): turning on sync discard
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): enabling ssd optimizations
=====================================================
BUG: KMSAN: uninit-value in extent_fiemap+0x2a1e/0x5820 fs/btrfs/extent_io.c:2938
 extent_fiemap+0x2a1e/0x5820 fs/btrfs/extent_io.c:2938
 btrfs_fiemap+0x203/0x240 fs/btrfs/inode.c:7943
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2d5a/0x3b40 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x6af/0xfe0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was stored to memory at:
 read_extent_buffer fs/btrfs/extent_io.c:4073 [inline]
 btrfs_item_key fs/btrfs/accessors.h:489 [inline]
 btrfs_item_key_to_cpu fs/btrfs/accessors.h:603 [inline]
 extent_fiemap+0x1dbb/0x5820 fs/btrfs/extent_io.c:2937
 btrfs_fiemap+0x203/0x240 fs/btrfs/inode.c:7943
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2d5a/0x3b40 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x6af/0xfe0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4500
 __alloc_pages_bulk+0x19e/0x1fa0 mm/page_alloc.c:4425
 alloc_pages_bulk_array include/linux/gfp.h:201 [inline]
 btrfs_alloc_page_array fs/btrfs/extent_io.c:764 [inline]
 btrfs_clone_extent_buffer+0x3e7/0x1180 fs/btrfs/extent_io.c:3272
 fiemap_search_slot fs/btrfs/extent_io.c:2665 [inline]
 extent_fiemap+0x1a65/0x5820 fs/btrfs/extent_io.c:2912
 btrfs_fiemap+0x203/0x240 fs/btrfs/inode.c:7943
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2d5a/0x3b40 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x6af/0xfe0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 7669 Comm: syz-executor.1 Not tainted 6.5.0-rc4-syzkaller-00251-gf0ab9f34e59e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
=====================================================

Crashes (24):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/07 01:56 upstream f0ab9f34e59e 4ffcc9ef .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/07/28 10:47 upstream 57012c57536f 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/07/28 10:47 upstream 57012c57536f 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/06/23 14:58 https://github.com/google/kmsan.git master e6bc8833d80f 09ffe269 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/05/05 10:51 https://github.com/google/kmsan.git master 81af97bdef5e 518a39a6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/05/03 07:53 https://github.com/google/kmsan.git master 81af97bdef5e 48e0a81d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/03/27 17:35 https://github.com/google/kmsan.git master 90ea0df61c98 f8f96aa9 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2022/12/02 11:56 https://github.com/google/kmsan.git master 49a9a20768f5 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in extent_fiemap
2023/08/14 23:17 upstream 2ccdd1b13c59 39990d51 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in copy_items
2023/07/26 23:37 upstream 18b44bc5a672 41fe1bae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in copy_items
2023/06/23 06:01 https://github.com/google/kmsan.git master e6bc8833d80f 09ffe269 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/06/03 08:08 https://github.com/google/kmsan.git master 2741f1b02117 a4ae4f42 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in copy_items
2023/02/28 14:12 https://github.com/google/kmsan.git master 97e36f4aa06f 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/02/16 19:22 https://github.com/google/kmsan.git master 9c866a280876 7338e3c4 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/02/04 23:05 https://github.com/google/kmsan.git master eda666ff2276 be607b78 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in copy_items
2023/01/26 06:38 https://github.com/google/kmsan.git master 41c66f470616 9dfcf09c .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/01/14 09:28 https://github.com/google/kmsan.git master e919e2b1bc1c 529798b0 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/01/12 17:12 https://github.com/google/kmsan.git master 219e919e391d 96166539 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2023/01/04 13:34 https://github.com/google/kmsan.git master 5c6259d6d19f 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in copy_items
2022/12/24 08:16 https://github.com/google/kmsan.git master 5c6259d6d19f 9da18ae8 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2022/12/19 11:37 https://github.com/google/kmsan.git master 5c6259d6d19f 05494336 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2022/12/19 11:30 https://github.com/google/kmsan.git master 5c6259d6d19f 05494336 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2022/12/15 05:10 https://github.com/google/kmsan.git master 5c6259d6d19f b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
2022/12/15 04:57 https://github.com/google/kmsan.git master 5c6259d6d19f b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386 KMSAN: uninit-value in paths_from_inode
* Struck through repros no longer work on HEAD.